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<?php
/* vim:set tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab: */
// +----------------------------------------------------------------------+
// | PHP version 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2 of the GPL license, |
// | that is bundled with this package in the file license.txt and is |
// | available through the world-wide-web at the following url: |
// | http://www.gnu.org/copyleft/gpl.html |
// +----------------------------------------------------------------------+
// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
// +----------------------------------------------------------------------+
// | Authors: James Heinrich <info�getid3*org> |
// | Allan Hansen <ah�artemis*dk> |
// +----------------------------------------------------------------------+
// | module.audio.vqf.php |
// | Module for analyzing VQF Audio files |
// | dependencies: NONE |
// +----------------------------------------------------------------------+
//
// $Id: module.audio.vqf.php,v 1.3 2006/11/16 23:16:31 ah Exp $
class getid3_vqf extends getid3_handler
{
public function Analyze() {
$getid3 = $this->getid3;
// based loosely on code from TTwinVQ by Jurgen Faul <jfaul�gmx*de>
// http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html
$getid3->info['fileformat'] = 'vqf';
$getid3->info['audio']['dataformat'] = 'vqf';
$getid3->info['audio']['bitrate_mode'] = 'cbr';
$getid3->info['audio']['lossless'] = false;
// Shortcuts
$getid3->info['vqf']['raw'] = array ();
$info_vqf = &$getid3->info['vqf'];
$info_vqf_raw = &$info_vqf['raw'];
// Get header
fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
$vqf_header_data = fread($getid3->fp, 16);
$info_vqf_raw['header_tag'] = 'TWIN'; // Magic bytes
$info_vqf_raw['version'] = substr($vqf_header_data, 4, 8);
$info_vqf_raw['size'] = getid3_lib::BigEndian2Int(substr($vqf_header_data, 12, 4));
while (ftell($getid3->fp) < $getid3->info['avdataend']) {
$chunk_base_offset = ftell($getid3->fp);
$chunk_data = fread($getid3->fp, 8);
$chunk_name = substr($chunk_data, 0, 4);
if ($chunk_name == 'DATA') {
$getid3->info['avdataoffset'] = $chunk_base_offset;
break;
}
$chunk_size = getid3_lib::BigEndian2Int(substr($chunk_data, 4, 4));
if ($chunk_size > ($getid3->info['avdataend'] - ftell($getid3->fp))) {
throw new getid3_exception('Invalid chunk size ('.$chunk_size.') for chunk "'.$chunk_name.'" at offset 8.');
}
if ($chunk_size > 0) {
$chunk_data .= fread($getid3->fp, $chunk_size);
}
switch ($chunk_name) {
case 'COMM':
$info_vqf['COMM'] = array ();
getid3_lib::ReadSequence('BigEndian2Int', $info_vqf['COMM'], $chunk_data, 8,
array (
'channel_mode' => 4,
'bitrate' => 4,
'sample_rate' => 4,
'security_level' => 4
)
);
$getid3->info['audio']['channels'] = $info_vqf['COMM']['channel_mode'] + 1;
$getid3->info['audio']['sample_rate'] = getid3_vqf::VQFchannelFrequencyLookup($info_vqf['COMM']['sample_rate']);
$getid3->info['audio']['bitrate'] = $info_vqf['COMM']['bitrate'] * 1000;
$getid3->info['audio']['encoder_options'] = 'CBR' . ceil($getid3->info['audio']['bitrate']/1000);
if ($getid3->info['audio']['bitrate'] == 0) {
throw new getid3_exception('Corrupt VQF file: bitrate_audio == zero');
}
break;
case 'NAME':
case 'AUTH':
case '(c) ':
case 'FILE':
case 'COMT':
case 'ALBM':
$info_vqf['comments'][getid3_vqf::VQFcommentNiceNameLookup($chunk_name)][] = trim(substr($chunk_data, 8));
break;
case 'DSIZ':
$info_vqf['DSIZ'] = getid3_lib::BigEndian2Int(substr($chunk_data, 8, 4));
break;
default:
$getid3->warning('Unhandled chunk type "'.$chunk_name.'" at offset 8');
break;
}
}
$getid3->info['playtime_seconds'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['audio']['bitrate'];
if (isset($info_vqf['DSIZ']) && (($info_vqf['DSIZ'] != ($getid3->info['avdataend'] - $getid3->info['avdataoffset'] - strlen('DATA'))))) {
switch ($info_vqf['DSIZ']) {
case 0:
case 1:
$getid3->warning('Invalid DSIZ value "'.$info_vqf['DSIZ'].'". This is known to happen with VQF files encoded by Ahead Nero, and seems to be its way of saying this is TwinVQF v'.($info_vqf['DSIZ'] + 1).'.0');
$getid3->info['audio']['encoder'] = 'Ahead Nero';
break;
default:
$getid3->warning('Probable corrupted file - should be '.$info_vqf['DSIZ'].' bytes, actually '.($getid3->info['avdataend'] - $getid3->info['avdataoffset'] - strlen('DATA')));
break;
}
}
return true;
}
public static function VQFchannelFrequencyLookup($frequencyid) {
static $lookup = array (
11 => 11025,
22 => 22050,
44 => 44100
);
return (isset($lookup[$frequencyid]) ? $lookup[$frequencyid] : $frequencyid * 1000);
}
public static function VQFcommentNiceNameLookup($shortname) {
static $lookup = array (
'NAME' => 'title',
'AUTH' => 'artist',
'(c) ' => 'copyright',
'FILE' => 'filename',
'COMT' => 'comment',
'ALBM' => 'album'
);
return (isset($lookup[$shortname]) ? $lookup[$shortname] : $shortname);
}
}
?>
|
